Apparatus for molding hollow objects from cement.



PATEETED JUNE 25, lOOv.

J. M. BOYLE. APPARATUS EOE MOLDINO HOLLOW OBJECTS PROM CEMENT.

IIIIIII f EN ,.ll f, EN m wwf n I!! Il!! APPLICATION FILED JAN` 23, 1907.-

' UNITED STATES PATENT OEEIOE. l

JAMES M. BOYLE, OF cOMPANY, A.

NEW YORK, N. Y., AssIGNOR TO MONOLITIIIO DUCT CORPORATION OE NEW Yoan. l

APPARATUS FOR MOLDING HOLLOW BJECTS FROM CEMENT.

which t e followin is a speciiication.

The invention re ates to apparatus for theVA manufacture of hollow Objects, conduits, etc. from plastic material, substantially as set forth 1n U. S. Letters Patent, No. 830,204,

struction of the removable plugland liquid.

granted to me September 4, 1906.

The invention consists in an apparatus enibodyi a distensible core of iexible material, means or admitting to said core a gas under pressure and means for admitting to said core a liquid under ressure whereby said gas is expelled, the said gas and the said liquid successively constituting the means for distendin the core: also in the construction whereby t egas and liquid are admitted and expelled from one end of the core when in elong ted or of sai core being closed: also in the conand gas connections associated t erewitli, as more particularly hereinafter claimed.

In the accom anying drawings-Figure 1 is a longitudina section of a conduit mold showing the as distended tubular core in lace and em edded in the lastic material. `ig. 2 is a cross section of t ie niold, with a bed of plastic material therein, having onits upper surface a matrix to receive the distended core. Fig. 3 is a cross section on the line a' .c of Fig. 1. Fig. 4 is a longitudinal section similar to Fig. 1, showing the distending gas replaced by liquid. Fig. 5 is a section showing the construction of the plug vwhich closes one end ot the tubular core and through which air and liquid are admitted. Similar numbers olf reference indicate like parts.

object to be molded.

1A is a distensible tube of suitable dimen- .sions to serve when distended as a core for core is closed byany suitable means, such,

for example, as a plugl of any desired construction. In the ot er end of the core is tubular form, the other end Speccation of Letters Patent. Application filed January 23, 1907. Serial H0. 863,693.

Patented June 25, 1907.

inserted an expansible plug, Fig. 5, constructed as follows:

Upon the threaded pipe 4, are two beveled disks 5 of metal. Circuinfereniially inelosing said disks is a sleeve (i ol` rubber, or other elastic material. 0n the exterior of the` tubular core l is placed a nietal ring 7. The plug being inserted in the end ol' core l, the outer disk is turned in any suitable way to cause compression ol` the rubber sleeve o, and hence expansiontliereoi radially. l'o conipress tlie wall of said core between said sleeve and thel outer ring 7.

Extending through the threaded pipe 4 is a pipe 8, the inner end of which within the core 1 is preferably bent radially, asshown in Fig. The outer end of said pipe connects with any suitable l'orin ol' gas reliel' valve, indicated at 9. ln said pipe isa valve 10. The valve 9 is inounied'on a coupling 11, which connects pipe #l with a two-way valve 12, operated by the handle 12%. When valve l2 is adjusted in one position, as for exaniple, the position shown in Fig. 1, it establishes connection iroin the pipe 14 lead.- ing to anysource A ol gas, preferably air, under ircssure, to the interior ol" tubular core 1. Y ien valve l2 is adjusted in another position, as for example, the position shown y in Fig. 4, it establishes connection from the pipe 15 leading to any source B of liquid, preferablywater, under pressure, to the interior of. tubular core 1. @On coupling 11 is anescape pipe 16, having valve 17,. When the valve l2 is adjusted in the position Inid way between those shown in Figs. 1 `ind 4, both pipes 14 and 15 may be closed.

In carrying Iny invention into practical eil'ect, I preferablyiirst place in a suitable mold, such for example, as the trough or box 1S, a bed 19 of the chosen plastic material.'

This term includes cement or concrete or any plastic mass, suitable to the object in view, which hardens on setting. While said bed is still plastic I form on its upper surface by any suitable means, a matrix groove or channel 20; the depth of which maybe equal to the seinidiameter ofthe tubular core 1, when distended. Thistubular core I distend by gas, the plugs before described being inserted In the ends, and the valve 12 being placed as in Fig. 1, to establish connection with the source of gas under pressure.v I may effect IOO IOS

Y liquid underpressure.

this distention before llaying the core in the groove or afterward. In either case, the distended tube substantially fits the groove. l then introduce further plastic material to about fill the mold as shown at 21. The valve 12 is then shifted to the position shown in Fig. 4, to establish connection with the The degree of pressure of said liquid should be in excess of that of the gas in the tube, so that said liquid replaces said gas, forcing said gas out of the core by the small pipe 8 to the relief valve 9, the valve 10 being opened. The liquid pressure in the core is maintained until the plastic material is set and hardened'suiiiciently to l retain its shape, after which the' valve 12 is admitting to said turned to close both pipes 14, 15, and the valve 17 is opened to allow thel liquid to escape. The core 1 being nolo ed ma condult, the plug at either end being removed lfor the purpose.

The principal advantage of substituting liquid for gas as the distending medium of the core, is the avoidance of leakagethrough the .fabric of the tube. "Where air, for exam# ple, is used, it will in the fabric, which are substantially impervious to water.

'I cyl-aim: v

1. In an apparatus for the manufacture of hollow objects, conduits and the like, from plastic material capable of hardening, a distensible core of flexible material7 means lor core a gesunder pressure, and mea-ns for admitting to said core liquid under pressure, to expel said gas.

2. In an apparatus for the manufacture of hollowobjects, conduits and the like, from plastic material capable of hardening, a tubular distensible core of flexible material nger distend?,y then be drawn out of the completed penetrate very fine pores It is furthermore found y that the liquid filled core produces a smoother lsurface on the interior of the conduit. Vopposite end, a duct in said closed at one end, means for admitting at will I gas or liquid under pressure to the opposite end of said core, and means for permitting gas or liquid `at will to escape from said last named end of said core.

' In an apparatus for lthe manufacture of' hollow objects, conduits and the like, from 5o plastic material capable of hardening, a tubular distensible core of flexible material closed at one end, a removable plug at the opposite end, a duct in said plug communieating with the interior of said core, and means for admitting tosaid duct at will liquid or gas under pressure.

4. In an apparatus for the manufacture of hollow objects,l conduits and the like, from plastic material capable of hardening, a tu- 6o bular distensible core of flexible material closed at one end, a radially expansible plug in the opposite end, a ring' encircling said tu-J bular core and circumferentially inclosing said plug, a duct in said plug` communicating with the interior of said core, and means for admitting to said duct at will liquid or gas under pressure. l

5. In an apparatus for the manufacture of hollow objects, conduits and the like', from 7o plastic material capable of hardening, a tu bular olistensiblel core lof flexible material closed at one end, a removable plug at the plug communieating with the interior ol' for admitting to said duct at will liquid or gas under pressure, a gas relief valve and a pipeextending from said relief valve through said duct.

In testimon7 *whereofV I have affixed my, 8C signature in presence of two Witnesses.

JAMES M. Borna.'

llfitnesses: JEANNIE H as'rm, q

GERTRUDE T. PORTER.

said core, means 

